Mouth-illuminator.



T. G. LEWIS.

MOUTH ILLUMINATOR.

APPLICATION Hum JUKE so, 1910.

978,910. Patented Dec.20, 1910.

uivrrE-ns'rATEs- PATENT OFFICE- rHEononE e.- LEWIS, 0E iwE'EALo, NEW YORK, ASSIGNOR TO BUFFALO DENTAL IllIANU- F'ACTUBING COMPANY, OF BUFFALO, NEW YORK, A CORPORATION'OF NEW YORK.-

MOUTH-ILIUMI'NATOR.

tion of a simple, effective and convenient lamp of this type which shall throw a clear white field of light free from filamentimages or other objectionable features.

Another object is to provide the lamp with simple means for readily increasing or reducing the diameter of'the field of light, as desired.

In the accompanying drawings: Figure 1 is a sectional elevation of the improved lamp or ,month' illuminatorp Figs. 2, 3, 4

and 5 are transverse sections on the correspondingly numbered lines in Fig. 1-. Fig.

6 is a fragmentary longitudinal section on line 6-43, Fig. 1'. Fig. 7 is a fragmentary cross section on line 7 7, Fig. 4:.

Similar letters of reference indicate corresponding parts throughout the several views.

The body of the illuminator comprises a rear section or hood A preferably of semicircular form, closed at its top and sides and open at its bottom, and a cylindrical front section or-lens-tube B of somewhat smaller diameter than the rear portion, which is riveted or otherwise securedto the latter.

To the rear end of the semicircular hood is The body is suspended from a suitable bracket D by arod or hanger E having its upper end pivotally andadjustably attached to the bracket, while its lower end is con-- nected with the lamp body by a universal or ball-and-socket joint F of any suitable construction, giving the..lamp a wide range of adjustment in all directions.

G indicates a sultable. lamp, preferablyan Specification of Letters Patent. Application filed June 30, 1910. Serial No. 569,688.

Patented'Dee. 20, 1910.

incandescent electric lamp having its bulb arranged within the'hood A on the rear side of the joint F. In the construction shown, the neck of the lamp passes through an openingin the top of the hood and the'lamp-- socket g is seated in a collar h secured to the Arranged in the rear end-of the lens-tube B in line with the bulb of the lamp G is a condensing lens I, and in the front end of said tube is a somewhat larger lens I, preferably of double convex form, which latter intensifies the light thrownb the'lamp and upper sideof the hood around said opening.

also eliminates the image -0 the lamp-filament from the field of light, producing a pure white field. To reduce the absorption of light, the lens-tube preferably has a white lining ,j of asbestos or other suitable material.

In the preferred construction shown in the drawings, the condensing lens -I is carried by a diaphragm K which is seated in the enlarged rear portion of the lens-tube and confined between the latter and the front end of the hood A, .as shown in Fig. I. diaphragm has a central aperture Z to the applied.

Secured to the rear side of the diaphragm K is a raised upright.- plate or bracket M having a comparatively large aperture m for the passage of the light-rays, said aperture being substantially in line with the loops of the lamp-filament, and concentric with the condensing lens, as shown in 1.

the pivot 'nfiso that by turning the'shutter to the right or the left any of its apertures'can be brought into coincidence with the bracketaperture. In the construction shown in the drawings, the shutter has four openlngs, the largest being of the same size as the bracket- The. i

front side of which the condensing lens is aperture m while the remainin three are progressively smaller, enablm t 1e operator to control a field of light of our diameters tures than that illustrated in the drawings,

if desired.

A catch or stop device is preferably employed for retaining the shutter in place and determining its several positions. The device shown in the drawings consists of a pin 0 projecting from the rear side of the bracket M and adapted to interlock with openings or recesses 0 in the shutter, one opposite each light-aperture thereof. The projecting end of this pin is rounded and the shutter has sufiicient elasticity to allow its locking openings to spring into and out of engagement with said pin.

By means of the handle C the illuminator can be tilted or adjusted to any desired angle or position, it being unnecessary to place the hand on any heate metallic parts of the device for this purpose.

The lenses have a fixed focus and no adjustment is therefore necessary to obtain the proper light. It has been found that the illuminator can be placed from eighteen to twenty-four inches from the patient and that the light will be equally eifective at either of the distances.

This improved lamp while projecting a clear white light into the mouth of a patient or other desired place, also throws the light upon the instrument table through the open bottom of the hood A. At the same time, the eyes of both the patient and operator are shaded and protected from the glare of the lamp by the hood.

In addition to the advantages stated, the lamp is strong and durable in construction and neat in appearance.

I claim as my invention:

1. An illuminator of the character described, comprising a hood, a lamp arranged therein, a diaphragm arranged in the hood in front of the lamp, a lens carried by said diaphragm, and a shutter mounted on the an the lamp.

scribed, com. rising a hood, :1 lens located at the front ens of the hood, a lam arranged in the hood behindsaid lens, a racket arranged between the lens and thelamp and having an aperture in line with the lens, and a shutterapplied to said bracket and having a plurality of different-sized openings cooperating with said bracket-aperture.

3. An illuminator of the character described, comprising a hood, a lens located at the front end of the hood, a lam arranged in the hood behind said lens, a bracket arranged between the lens and the lamp and havi an aperture in line with the lens, and an oscillating shutter pivoted to said bracket and having a plurality of difit'erent-sized openings coiiperating with the bracket aperture.

45. An illuminator of the character described, comprising a hood, a lens located at the front end of the hood, a lam arranged in the hood behind said lens, a racket arranged between the lens and the lamp and having an aperture in line with the lens, a shutter applied to said bracket and having a plurality of difierent-sized openings coiiperating with said bracket-aperture, and means for retaining the shutter in its several positions.

5. An illuminator of the character described, coniprising a hood, a lens located at the front end of the'hood, a lam arranged in the hood behind said lens, a racket arranged between the lens and the lamp and having an aperture in line with the lens and a locking-pin, and an oscillating shutter pivoted to said bracket and having a plurality of different-sized apertures cooperating with the bracket-aperture and corresponding locking openings adapted to interlock with said pm.

Witness my hand this 28th day of'June,

THEODORE Gr. LEWIS. Witnesses:

C. F. G'EYER, E. M. GRAHAM.

diaphragm and interposed between said lens I 2. An illuminator of the character de- 

